The criticisms were contained in a scathing letter, seen by The Daily Telegraph, from Richard Stone, a RF Trustee, to senior William J. Clinton Foundation officials.

The fund-raiser has been described as the “worst party ever” by angry guests, some of whom were forced to wait outside for up to 90 minutes while high profile attendees were admitted inside.

When they were eventually admitted, guests complained that the underground venue “stank”, perspiration was “dripping off the walls” while the rooms were “chaotic” and too overcrowded to even see the former president.

Others left by taxi without having entered the exclusive event, which was hosted by Mr Clinton, 65, and his daughter Chelsea, 32.

Glamorous photographs of the event document Mr Clinton’s short speech addressing the issue of climate change, as well as smartly-dressed attendees enjoying themselves.

But other photographs, taken from outside the venue, show hundreds of people queuing along a wall and guests entering through doors painted with graffiti.

Writing on behalf of the RF and the Reuben family, Mr Stone said he wanted to “express our sincere disappointment” at the event, which he described as a “total shambles”.

He wrote: “We are frankly embarrassed to have been associated with such a poorly run occasion.

“Ultimately, it is very upsetting that those who paid money to attend were left with a bitter taste in their mouths due to bad event planning and shambolic organisation on the night.

“We certainly think that those who left without entering or those who missed most of the event should be entitled to a refund.”

It was addressed to the Clinton Foundation’s director of development and philanthropy Dennis Cheng, a former deputy chief of protocol at the US State Department and Hillary Clinton staffer and Emily Wurgaft, a development officer, at the foundation’s Millennium Network.

Mr Stone added: “We have been inundated with messages and phone calls from our friends and contacts who bought tickets venting their frustration at having to wait for an hour and a half in the queue outside, or those who found it chaotic and overcrowded inside.

“We also had complaints about the lack of professionalism and courtesy of the organising staff and security.

“Many guests never even made it into the event and some were seen leaving and catching taxis from the queue. It is a great shame that many people who spent money to attend didn’t even get a chance to do so.”

Mr Stone also attacked the event’s planner, Steven Moffett, whom appeared to be “totally out of his depth” while the foundation’s treatment was poor and it did not even get thanked.

The Foundation has been known to hold "some of the best events", including a Haiti earthquake fund-raiser, which has been described as one of the world's "most glamorous galas", Mr Stone said.

He added: “To now have such negative reaction from the press and from our many relationships (both personal and business) is most distressing.”

The Millennium Network event was arranged to encourage leaders and philanthropists to get involved in the work of the Clinton Foundation, which aims to improve global health, strengthen economies, promote healthier childhoods, and protect the environment.

A spokesman for the Reuben Foundation declined to comment on Friday.

A spokesman for the Clinton foundation did not respond to repeated requests for comment.